[From string (line 22) ]                    
                                            
@startuml                                   
                                            
 "x" : class  = data.frame                  
 "x" : typeof  = list                       
 "x" : mode  = list                         
 "x" : length = 4                           
                                            
 "x" : __attributes__                       
                                            
 "x" : .names = X c b n                     
                                            
 "x" : .row.names = 1 2 3                   
                                            
                                            
 "x.1.X" : class  = integer                 
 "x.1.X" : typeof  = integer                
 "x.1.X" : mode  = numeric                  
 "x.1.X" : length = 3                       
                                            
  "x" *--> "x.1.X"                          
^^^^^                                       
 Syntax Error? (Assumed diagram type: state)